41b Fungi» Bacteria und Pathologie. 



bed, and an exhaustive critical revlew is made of Hypocrea alutacea 

 Tulasne, and Bresadola's new H. Lloydii, which Atkinson holds is 

 H. alutacea, as a result of which the conchision is drawn that H. alu- 

 tacea belongs to Karsten's genus Podostroma, and therefore should 

 be linown as Podostroma alutacea (Pers.) Atkinson. A citation of Syno- 

 nyms, and nine Photographie reproduetions of the plant, and its asci 

 and spores are added. von Sehrenk. 



ATKINSON;, G. F., The Genera Balansla and Dothichloe i n 

 the United States with aconsideration oftheir 

 economic importance. (Journal of Mycoiogy. XI. 

 1905. p. 248—267. pl. 81—88.) 



An exhaustive discussion, with a large number of literature ci- 

 tations, of the genera Balansla and Dothichloe. The genus Balansla 

 Spegazzini is redescribed, and its type is described under the new name 

 Balansla Hypoxylon (Pk.) Atkinson (syn. Dothichloe hypoxylon Atk., 

 Hypocrella hypoxylon Ellis^ Ephells borealls E. and E. etc.). 



In addition the author discusses and describes B. Vorax (B. and C.) 

 Emend. Atkinson, and B. dlscoldea P. Hennings. The new genus Do/Ä/- 

 c/?/o^ Atk. (already published [Torrey Bot. Club. XXI. 1894. p. 223.] ba- 

 sed on Berkeley 's Dothldea vorax, is described with two species, 

 D. atramentosa (B. and C.) Atkinson and D. arlstidae A. and K. A dis- 

 cussion of the economic importance of the species closes the paper. 

 Eight plates with reproduetions of numerous photomicrographs illustrating 

 the perithecia^ asci, and spores add interest to the paper. 



von Schrenk. 



BOULANGER, Em., Germination de la spore echinulee 

 de la Truffe. (CR. Soc. Biol. Paris. T. LX. 13 janv. 

 1906. p. 42—43. PI. I, II.) 



La germination des ascospores a ete observee ä l'interieur meme 

 de l'asque de Tuber melanosporum. L'exospore brune eclate, generale- 

 ment vers l'equateur^ puis est detruite. La spore revetue alors d'une 

 membrane incolore emet un tube germinatif. 



L'auteur reconnait que la structure cellulaire qn'il avait cru aperce- 

 voir dans l'exospore est l'effet d'une Illusion. 11 reconnait egalement que 

 les Corps oü il croyait voir des antheridies et des oogones de Tnber 

 sont des grains de poUen de Pin ou de Sapin apportes accidentellement 

 dans ses preparations (voir Bot. Centr. XCIIl. p. 229). 



La Truffe, par la germination de ses spores^ rentre donc dans la 

 regle generale. Paul Vuülemin. 



Christman, A. H., Observations on the wintering of 



Rusts. (Trans. Wisconsin Academy of Science etc. XV. 



1905. p. 88.) 



After discussing the work of Eriksson and others on the winter- 

 ing of uredospores, the author describes some experiments made during 

 the winter of 1902—1903 in which he tested the germinating power of 

 uredospores, collected at various times, during the winter. He succee- 

 ded in germinating uredospores throughout the winter, although the 

 same were exposed for three months, almost continuously, to a tempe- 

 rature below freezing. A number of additional data are given on the 

 general subject of the resistance of spores and mycelium to northern 

 winters. von Schrenk. 



